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Posted to hdfs-issues@hadoop.apache.org by "Chen Liang (JIRA)" <ji...@apache.org> on 2016/07/25 17:24:20 UTC
[jira] [Commented] (HDFS-10682) Add metric to measure lock held
time in FSDataSetImpl
[ https://issues.apache.org/jira/browse/HDFS-10682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392330#comment-15392330 ]
Chen Liang commented on HDFS-10682:
-----------------------------------
added a initial patch, which includes a lock checker class exposing method for lock held time, and instrumented FsDatasetImpl to call the method.
> Add metric to measure lock held time in FSDataSetImpl
> -----------------------------------------------------
>
> Key: HDFS-10682
> URL: https://issues.apache.org/jira/browse/HDFS-10682
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Chen Liang
> Assignee: Chen Liang
> Attachments: HDFS-10682.001.patch
>
>
> Add a metric to measure the time the lock of FSDataSetImpl is held by a thread. The goal is to expose this for users to identify operations that locks dataset for long time ("long" in some sense) and be able to understand/reason/track the operation based on logs.
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